concede vs contend

concede

verb
  • To yield or suffer; to surrender; to grant 

  • To admit or agree to be true; to acknowledge. 

  • To yield or make concession. 

  • (of a bowler) to have runs scored off of one's bowling. 

  • To grant, as a right or privilege; to make concession of. 

  • To have a goal or point scored against 

contend

verb
  • To be in opposition; to contest; to dispute; to vie; to quarrel; to fight. 

  • To be in debate; to engage in discussion; to dispute; to argue. 

  • To believe (something is reasonable) and argue (for it); to advocate. 

  • To struggle or exert oneself to obtain or retain possession of, or to defend. 

  • contend with: To try to cope with a difficulty or problem. 

How often have the words concede and contend occurred in a corpus of books? (source: Google Ngram Viewer )